iOS App crashing on production but not on debugging

Question

I have been working on an iOS app. It was working fine until a couple of days ago, it started behaving strangely. The app crashes on production but it creates no crash logs. However, when same scenario is tested out in QA, it works fine. Now I have been trying to find out the reason but without any crash logs or crash in debugging mode, it has become very difficult for me.

Any suggestion, how to tackle it?

Thanks!

P.S. I am using XCode 4.6.1 and app is for iOS 6.0.

Answer 1

Answering my own question, I have found out after detailed research on the internet that some crashes kill the application before logging the Crash Log. My error was that of a delegate property for my services. After long hard tries, I got to the root cause of the problem, since I had converted the code to ARC so the delegate property was unsafe_unreatained, which released the delegate while it was still in use by the service, so I just had to convert it into strong and set it to nil in dealloc. Further description can be seen here: https://stackoverflow.com/a/9065105/1351911.

Answer 2

I had the same problem, building ipa's in Xcode 4.6.1 with sdk version 6.0 or above crashes the app like anything. Try archiving it in Xcode 4.4 or 4.3 may be a lower version and try.